Question

substance/gases that make one feel no pain (give one word for)​

Answer 1

Answer:

For example, nitrogen dioxide is brown-y orange, chlorine has a yellowish green hue and iodine vapour is a vivid purple (see image above). Other gases in the atmosphere (particularly oxygen, carbon dioxide and water vapour) also absorb light, but at ultraviolet and infrared wavelengths that we can't see.

Explanation:

Answer 2

Answer:

hydrogen, oxygen, nitrogen, carbon dioxide, carbon monoxide, helium, argon, neon, ozone and water vapour.